Linux: Redirect Command Output to Files (Overwrite & Append)

Redirecting Command Output in Linux

• 💡 The Linux terminal allows redirecting command output into files using special characters.
• 🎯 This is useful for saving logs, exporting lists, or creating simple text files from command results.

Understanding Redirection Operators

• ⚠️ The single greater-than sign (>) is used to overwrite the content of a file with the new command output.
• ➕ The double greater-than sign (>>) is used to append new command output to the end of an existing file, preserving previous content.

Practical Examples

• 🚀 The ls command can be used to list directory contents and redirect the output to a file named file.txt using ls > file.txt.
• 📌 The pwd command, which shows the current working directory, can also be redirected using pwd > file.txt, overwriting the previous ls output.
• 📝 To combine outputs, use >> for appending. For instance, ls >> file.txt will add the directory listing to the existing content of file.txt.

Writing Plain Text with echo

• 💬 The echo command can be used to write plain text directly into a file.
• ✍️ For example, echo test > filetot.txt will create filetot.txt with the word "test" inside.
• 🔄 Using echo test line two >> filetwo.txt appends text, while echo test line three > filetwo.txt would overwrite filetwo.txt with only "test line three".